... , such as marble, granite, glass, ceramic, hard concrete and brick;4. High performance (sharp cutting &long life)5. ... be more sharp,what’s more,the grinding force and the grinding temperature will be apparently decreased.3, ... 5, Cutting granits,concrets,rebars,ceramics,glass,woods,plastics and so on,which is highly efficient.6, Strong ... etc. vucamm brazed Dry Diamond Core Drill Bit coating red paint